Beat Angel Escalayer is an eroge series created by Alice Soft, and a hentai anime OVA animated by Pink Pineapple in 2002.
Sayuka Kōenji is the guardian of the Earth and has the ability to transform into her alter ego Escalayer to protect the world from the evil forces of the Dielast. However, in order to transform into Escalayer she must recharge her power source, the Doki Doki Dynamo which can only be recharged through sexual excitement. This was previously achieved through lesbian sex with her gynoid friend Madoka, however, this has become less effective and Madoka recruits the school playboy Kyōhei Yanase whose vast sexual experience will help Sayuka transform.
Sayuka Kouenji, is the Escalayer, guardian of the Earth against the dark forces of the Dielast. By her side is the android Madoka, and it is Madoka’s job to track and recharge the source of Sayuka’s power, the Doki Doki Dynamo. Located within Sayuka’s body, the Doki Doki Dynamo can only be recharged when Sayuka experiences a high level of sexual arousal which, until recently, Madoka has been able to provide her. With unacceptably low energy levels facing them, Madoka brings in the assistance of Kyohei Yanase, a boy from Sayuka’s school. Kyohei once harboured a crush for Sayuka, and his sexual prowess could not have come sooner. For now arrayed against these three defenders of the Earth is the Dielast version of the escalayer, the FM77, who is ruthless in combat, and brimming with violent desire.
Earth is being invaded by the evil organization, Dai-Lust.
Beat Angel Escalayer
After summer break, there is a new transfer student in your class, Kouenji Sayuka. Sayuka is your childhood friend, but somehow she has no memory of you at all, and out of nowhere she now has a younger sister, Kouenji Madoka. The next day after school, an evil organization known as Dai-Lust began invading Earth. You witness Sayuka masturbate and transform into a warrior named Escalayer who then defeat the bad guys.
Later, Madoka explained to you that Sayuka’s consciousness has been transferred to a bio-body (which caused her to lose her memory), which has great fighting capabilities, but requires energy from sexual excitement to charge up. Madoka (who turns out to be a support android) threatens that if you do not help them she is going to distribute throughout the world the love letter you wrote to Sayuka when you were in kindergarden.
So begins the fight to save the world.